Best settings for my Nikon d3100 for cosplay shoots?

I'm going to a cosplay convention this friday and i'm bringing along my new d3100. What settngs would be best?

If you have to ask that question then AUTO is your best choice.
No one can give you settings. They are determined by measuringthe light. In your scene and then deciding what you want the image to look like. The settings are a direct result of that measurement and some knowledge of the creative/exposure controls.